feat(rule13): 执行前分歧重评估闸——main 撞声明范围→needs_attention 重评估

通用规则13的(B)半边：sync main 之前先跑 reevalScopeGate，
以 git diff HEAD...origin/main 取 main 自分支点以来改动的文件，
与任务 scopeFiles 求交集；非空即 emit needs-reeval →
daemon markReeval 直接转 needs_attention（不重试/不计失败/run收尾cancelled）。

- checks.ts: + reevalScopeGate / ReevalGateFn / ReevalGateResult
- pipeline.ts: createWorktree 后、syncMain 前插入重评估闸 + reevalGate 依赖注入
- protocol.ts: + needs-reeval OutboxRecord/Payload 事件
- ingest.ts: + case 'needs-reeval' → store.markReeval
- store.ts: + markReeval（executing→needs_attention，不进重试链）
- status.ts: executing 合法转移 + needs_attention
- 测试 +5：reevalScopeGate(命中/未命中/空/无前移/git错) · pipeline(命中emit/未命中续跑) · store.markReeval；全套 242 绿
- docs: optimization-plan.html 规则13 标 ✅ 已实现

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

test/pipeline.test.ts

@@ -264,6 +264,33 @@ test('planner：CC 失败 → emit failed', async () => {
   assert.equal(emitted.at(-1)?.type, 'done');
 });
 
+test('规则13 分歧重评估：reevalGate 撞声明范围 → emit needs-reeval + done，不执行/不复审/无 failed', async () => {
+  const { emitted, emit } = collector();
+  const job: JobSpec = { ...fakeJob, task: { ...fakeTask, scopeFiles: ['src/**'] } };
+  let ranTask = false;
+  await runPipeline(job, mockDeps({
+    reevalGate: async () => ({ overlap: ['src/a.ts', 'src/b.ts'] }),
+    runTask: async () => { ranTask = true; return okRun; },
+  }), emit);
+
+  const re = find(emitted, 'needs-reeval');
+  assert.ok(re, '撞声明范围应 emit needs-reeval');
+  assert.deepEqual(re.files, ['src/a.ts', 'src/b.ts']);
+  assert.match(re.reason, /原方案可能已过时/);
+  assert.equal(ranTask, false, '重评估时不应执行任务');
+  assert.equal(find(emitted, 'result'), undefined, '不应 emit result');
+  assert.equal(find(emitted, 'failed'), undefined, '重评估不是失败，不应 emit failed');
+  assert.equal(emitted.at(-1)?.type, 'done', '末尾应为 done');
+});
+
+test('规则13 分歧重评估：无重叠 → 正常往下执行（emit result）', async () => {
+  const { emitted, emit } = collector();
+  const job: JobSpec = { ...fakeJob, task: { ...fakeTask, scopeFiles: ['src/**'] } };
+  await runPipeline(job, mockDeps({ reevalGate: async () => ({ overlap: [] }) }), emit);
+  assert.equal(find(emitted, 'needs-reeval'), undefined, '无重叠不应触发重评估');
+  assert.ok(find(emitted, 'result'), '应正常执行到 result');
+});
+
 test('parseDecompose：取最后一个 json 块；非法/缺失 → null', () => {
   assert.equal(parseDecompose('no json here'), null);
   assert.equal(parseDecompose('```json\n{"subtasks":[]}\n```'), null, '空 subtasks → null');